I liked how this came out, although I felt that at the same time there were some issues that made the game somewhat look unpolished or incomplete, especially considering there is a paid copy:

-Some features are missing compared to the TI-83+ original. For example, the background in Level 3 and 9 should normally scroll by itself (backwards in LV 9) or be animated to act like it's scrolling. The animations speed are sometimes wrong too.-Although on the PC it's fine, on my Nexus 5 the frame rate is extremely choppy. I'm unsure if much can be done about it due to the language limitations, though, but I suspect that you are rendering the entire map every frame rather than only what's visible.-We can change the resolution as we see fit, which gives an unfair gaming advantage to people playing in full screen mode. I think that instead, the game should scale itself up (using no smoothening filtering on the sprites) so that it always remains a 20x15 sprite grid in 4:3 or 27x15 in 16:9.-Since there is music, maybe some bouncing or hit sound effects could be added.-Also the highscore list no longer works.-The title screen logo animation is missing

I agree. It would probably either need to be Ndless with full graphics like the above or Lua with limited graphics and scrolling. I think it should probably stick more to the original, though, by adding missing features mentionned above (although screen resolution should not be a problem).

Here is the level 3 background as it should be (looping through 4 cloud tiles at 20 fps like the original, although you could make it just scroll pixel by pixel with an offset value)